Akazukin-kun no Shuuchaku

Anzu is a girl who longs for a prince on a white horse. One day, she finds a mysterious book in the school library. When she opens it, the characters from Grimm's fairy tales sealed inside the book are released...!? And so begins a dark and emo fairy tale x school fantasy woven by a yandere Little Red Riding Hood boy and a bookish dreamer girl...

(Source: Mag Kan, translated)